How to make a cake you'll never eat.

Ingredients.

Method.

Serves 1.

Input

The only line of input contains a sequence of integers a₀, a₁, ... (1 ≤ a₀ ≤ 100, 0 ≤ a_i ≤ 1000 for i ≥ 1).

Output

Output a single integer.

A Piece of Cake